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830s decade ran from January 1, 830, to December 31, 839.
China A Uyghur Turk sues the son of a Chinese general, who had failed to repay a debt of 11 million government-issued copper coins. Emperor Wen Zong hears the news, and is so upset that he not only banishes the general, but attempts to ban all trade between Chinese and foreigners except for goods and livestock. This ban is unsuccessful, and trade with foreigners resumes, especially in maritime affairs overseas.
Europe June –
Lothair I, eldest son of Emperor Louis the Pious, joins the rebellion of his brothers Pepin I and Louis the German, with the assistance of Archbishop Ebbo. Louis is forced to abdicate, on the plains of Rothfield (near Colmar).
Mojmir I, Moravian duke, expels Prince Pribina from his homeland (western part of modern Slovakia). He unifies Great Moravia and becomes the first known ruler of the Moravian Slavs, who founds the House of Mojmir (approximate date). Galindo Aznárez I, Frankish count, usurps the Catalan counties ( ) of pagi Pallars and Ribagorza, in the Spanish March (modern Spain), a buffer zone between the Pyrenees and the Ebro River.
Abbasid Caliphate Driven by tensions between his favoured Turkish guard and the populace of Baghdad, Abbasid caliph al-Mu'tasim moves his residence to the new city of Samarra, 130 km north of Baghdad. With brief interruptions, the city will remain the seat of the Abbasid caliphs until 892.
Britain King Drest IX dies after a 3-year reign. He is succeeded by his cousin Eóganan, as ruler of the Picts.
July 22 – Battle of Dazimon: Caliph Al-Mu'tasim launches a major punitive expedition against the Byzantine Empire, targeting the two major Byzantine fortress cities of central Anatolia ( Ancyra and Amorium). He mobilises a vast army (80,000 men) at Tarsus, which is divided into two main forces. The northern force, under commander Al-Afshin, invades the Armeniac Theme from the region of Melitene, joining up with the forces of the city's emir, Umar al-Aqta. The southern, main force, under Al-Mu'tasim, passes the Cilician Gates into Cappadocia. Emperor Theophilos attacks the Abbasids, inflicting 3,000 casualties, but is later heavily defeated by a counter-attack of 10,000 Turkish horse archers. Theophilos and his guard are encircled, and barely manage to break through and escape.    August – Siege of Amorium: The Abbasids besiege the Byzantine fortress city of Amorium, which is protected by 44 towers, according to the contemporary geographer Ibn Khordadbeh. Both besiegers and besieged have many siege engines, and for several days both sides exchange missile fire. However, a Muslim prisoner defects to Al-Mu'tasim, and informs him about a place in the wall which has been badly damaged by heavy rainfall. The Abbasids concentrate their hits on this section, and after two days manage to breach the city wall. After two weeks of repeated attacks, the Byzantine defenders surrender. The city is sacked and plundered, 70,000 inhabitants are slaughtered, and the survivors are sold as slaves.
Abbasid Caliphate A conspiracy is discovered, led by General
'Ujayf ibn 'Anbasa, to assassinate Al-Mu'tasim while he is campaigning, and place his nephew Al-Abbas ibn al-Ma'mun on the throne. A widespread purge of the army follows, which cements the leading role of the Turkish slave-soldiers ( ) in the Abbasid military establishment. ghilman
Babak Khorramdin, an Iranian military leader, is cruelly executed by order of al-Mu'tasim.  The Yezidi rise up against the Abbasids (approximate date). 
Sicard of Benevento is assassinated by a conspiracy among the nobility. He is succeeded by Radelchis I, chief army officer and treasurer of Sicard, who proclaims himself ruler of Benevento. He imprisons Siconulf, heir and brother of Sicard, in Taranto. But Amalfitan merchants, led by Landulf I, the of gastald Capua, and with the support of Guaifer, rescue him from prison. Siconulf is proclaimed prince of Salerno, and a civil war erupts, which splits the Lombard principality in Southern Italy. 
Third Civil War: King Louis the German, grandson of Charlemagne, invades Swabia. His nephew, Pepin II of Aquitaine, and his Gascon subjects, conquer territory all the way to the Loire.
May 20 -- Thirteen months before his death, Louis the Pious, successor to his father Charlemagne, consents to the division of Charlemagne's empire among his sons in a declaration at Worms. Upon Louis I's death in 840, Lothair (age 45) is devised Middle Francia that includes Switzerland and northern Italy; Louis the German (Louis II), age 36, receives Eastern Francia that includes much of Germany; and Charles the Bald (17) gets West Francia that incorporates most of France. The
Hungarians (also known as Magyars) who until then have lived east to the Carpathians, raid the Lower Danube at the request of the Bulgarian Empire against the Byzantine insurgents.  Approximate date – Danish Vikings return to ravage the Frisian coast (sacking Dorestad for the second time).
Egbert of Wessex dies after a 37-year reign, and is succeeded by his son Æthelwulf ("Noble Wolf") as ruler of Wessex. Æthelwulf's eldest son, Æthelstan, is made sub-king of Kent, Essex, Surrey and Sussex, under his father. Eóganan mac Óengusa, King of the Picts, his brother Bran, Áed mac Boanta, King of Dál Riata, "and others almost innumerable" are killed in a battle fought by the men of Fortriu in Scotland against Vikings.  Alpín mac Echdach (Alpín II) apparently succeeds Áed.
Adalard, Frankish nobleman (approximate date)
Athanasius I, bishop of Naples (d. 872)
Carloman of Bavaria, Frankish king (or 828)
Charles, Frankish bishop (or 825)
Engelberga, Frankish empress (approximate date)
Irmgard, Frankish abbess (or 833)
Ishaq ibn Hunayn, Muslim physician (approximate date)
Junayd of Baghdad, Muslim Sufi (d. 910)
K?k?, emperor of Japan (d. 887)
Lambert III, Frankish nobleman (d. 882)
Naum of Preslav, Bulgarian writer (approximate date)
Robert the Strong, Frankish nobleman (approximate date)
Rimbert, Frankish archbishop (d. 888)
Rurik, prince of Novgorod (approximate date)
Wulgrin I, Frankish count (approximate date)
Yahya ibn Mu'adh al-Razi, Muslim Sufi (d. 871) Yunju Daoying, Chinese Buddhist teacher (d. 902)
May 7 – Ibn Hisham, Muslim historian
July 20 or 834 – Ansegisus, Frankish abbot
August 9 – Al-Ma'mun, Muslim caliph (b. 786)
Conchobar mac Donnchada, High King of Ireland
Diarmait mac Tommaltaig, king of Connacht (Ireland)
Dou Yizhi, chancellor of the Tang Dynasty
Du Yuanying, chancellor of the Tang Dynasty (b. 769)
Enravota, ruler of the Bulgarian Empire (approximate date)
García Galíndez ( the Bad), count of Aragon
Nagabhata II, ruler of the Gurjara-Pratihara Dynasty
Song Shenxi, chancellor of the Tang Dynasty Yuthog Yontan Gonpo, Tibetan high priest (b. 708)
July 20 or 833 – Ansegisus, Frankish abbot
Adelchis I, duke of Spoleto ( Italy)
Cellach mac Brain, king of Leinster ( Ireland)
Fridugisus, Anglo-Saxon abbot (approximate date)
Gaucelm, Frankish nobleman
Nasr ibn 'Abdallah, Muslim governor
Odo I, Frankish nobleman
Óengus II, king of the Picts
Robert III, Frankish nobleman (b. 800)
Wang Chengyuan, Chinese general (b. 801)
Wang Tingcou, general of the Tang Dynasty William, Frankish nobleman
Berengar the Wise, Frankish nobleman
Duan Wenchang, chancellor of the Tang Dynasty (b. 773)
Jia Su, chancellor of the Tang Dynasty
Jayavarman II, founder of the Khmer Empire
John IV ( the Peacemaker), bishop of Naples
K?kai, Japanese Buddhist monk (b. 774)
Li Cou, prince of the Tang Dynasty
Li Fengji, chancellor of the Tang Dynasty (b. 758)
Li Zhongyan, chancellor of the Tang Dynasty
Lu Sui, chancellor of the Tang Dynasty (b. 776)
Lu Tong, Chinese poet (b. 790)
Muhammad al-Jawad, 9th Twelver Sh?'ah Im?m (b. 811)
Sabrisho II, patriarch of the Church of the East
Song Ruoxian, Chinese scholar, lady-in-waiting and poet (b. 772)
Shu Yuanyu, Chinese official and chancellor
Vladislav, duke of Croatia (approximate date)
Wang Shoucheng, Chinese eunuch and official
Wang Ya, chancellor of the Tang Dynasty
Yang Zhicheng, Chinese governor ( ) jiedushi Zheng Zhu, Chinese general and official
March 17 – Haito, bishop of Basel
Adalram, archbishop of Salzburg
Aznar Sánchez, duke of Gascony
Herefrith, bishop of Winchester
Heungdeok, king of Silla (b. 777)
Lambert I, Frankish nobleman
Malamir, ruler of the Bulgarian Empire
Matfrid, Frankish nobleman
Muhammad ibn Idris, emir of Morocco
Nicetas the Patrician, Byzantine official
Prosigoj, Serbian prince (approximate date)
Ralpacan, emperor of Tibet (b. 802)
Wala of Corbie, Frankish nobleman Wang Zhixing, general of the Tang Dynasty (b. 758)
November 6 – Li Yong, prince of the Tang Dynasty
Al-Abbas ibn al-Ma'mun, Muslim prince and general
Babak Khorramdin, Iranian leader of the Khurramite uprising against the Abbasid Caliphate
Boniface II, margrave of Tuscany (approximate date)
Bran mac Fáeláin, king of Leinster ( Ireland)
Eadhun, bishop of Winchester
Frederick of Utrecht, Frisian bishop (approximate date)
Pepin I of Aquitaine, king of Aquitaine (b. 797)
Ralpacan, king of Tibet (approximate date)
Ratimir, duke of Pannonian Croatia
'Ujayf ibn 'Anbasa, Muslim general
Willerich, bishop of Bremen Ziyadat Allah I, Muslim emir
Áed mac Boanta, king of Dál Riata
Aznar I, king of Aragon
Cathal mac Muirgiussa, king of Connacht
Chengguan, Chinese Buddhist monk (b. 738)
Cummascach mac Congalaig, king of Brega
Egbert, king of Wessex
Eóganan mac Óengusa, king of the Picts
Ibrahim ibn al-Mahdi, Muslim prince (b. 779)
Muhammad at-Taqi, Muslim ninth Ism?'?l? imam (or 840)
Muiredach mac Eochada, king of Ulaid
Pei Du, chancellor of the Tang Dynasty (b. 765)
Rorgon I, count of Maine (or 840)
Sicard, prince of Benevento
Vache, prince of Kakheti Wiglaf, king of Mercia
Anglo-Saxon Chronicle, pp. 62-63.
"Al-Qayrawan hospital, Tunisia in 830". Archived from the original on April 25, 2012 . Retrieved 2011.
^ Nelson, Janet L. The Annals of St-Bertin. Manchester: Manchester UP, 1991. Print.
^ Smith, p. 83.
^ J. Norwich,
Byzantine: The Apogee, p. 47.
Parker, Philip (2015). . Penguin Random House. p. 423. The Northmen's Fury: A History of the Viking World ISBN . 9780099551843
^ Bush, Robin (1994). Somerset: The complete guide. Wimborne, Dorset: Dovecote Press, pp. 55-56.
^ W. Treadgold,
A History of the Byzantine State and Society, p. 440.
^ John V.A. Fine, Jr. (1991). The Early Medieval Balkans: A Critical Survey from the Sixth to the Late Twelfth Century, p. 109.
^ Treadgold 1997, p. 441.
^ Haldon 2001, p. 80.
^ Kiapidou 2003, Chapter 1.
^ Charles-Edwards, pp. 428-31; Padel, "Cornwall", Davies, p. 342; Stenton, p. 235.
Annals of Inisfallen, 838. Seán Mac Airt, The Annals of Innisfallen Dublin: 1951 available at UCC Celt Website.
The Golden Age of Islam by Maurice Lombard, p. 152. ISBN 1-55876-322-8.
^ M. Th. Houtsma, 1993, E. J. Brill's First Encyclopaedia of Islam, 1913-1936: Volume 4 - p. 1136, Brill.
^ Kreutz, Barbara M (1991). Before the Normans: Southern Italy in the Ninth and Tenth Centuries, p. 23 (University of Pennsylvania, Press: Philadelphia).
^ Bóna, István (2000).
The Hungarians and Europe in the 9th-10th centuries. Budapest: Historia - MTA Történettudományi Intézete, p. 11. ISBN 963-8312-67-X.
. Annals of Ulster